238 Memoir Sears Foundation for Marifie Research 



Gill opening lengths: ist 1.8, 1.7; 2nd 1.8, 1.8; 3rd 1.8, 1.8; 4th 1.8, 1.7; 5th 



1.4, 1.2. 



First dorsal fin: vertical height 4.9, 5.4; length of base 6.9, 7.4. 



Second dorsal fin: vertical height 4.2, 5.2; length of base 8.8, 8.7. 



Anal fin: vertical height 2.9, 3.5; length of base 8.1, 9.1. 



Caudal fin: upper margin 27.O, 27.8; lower anterior margin 9.9, 8.4. 



Pectoral fin: outer margin 13.0, 13.8} inner margin 8.1, 8.5; distal margin 9.5, 



10.7. 



Distance from snout to: ist dorsal 31.4, 31.2; 2nd dorsal S^-S-> 5^-4-y upper caudal 



73.0, 72.2; pectoral 20.4, 19.45 pelvics 39.2, 42.6; anal 57.8, 56.7. 



Interspace between: ist and 2nd dorsals 16.9, 17. i; 2nd dorsal and caudal 7.6, 



7.7; anal and caudal 5.0, 4.7. 



Distance from origin to origin of: pectoral and pelvics 22.2, 24.35 pelvics and 



anal 16.9, 14.6. 



Trunk slender, its height abreast of origin of ist dorsal only about •'/'r as great as its 

 length to origin of caudal, its dorsal profile only slightly arched, its ventral profile nearly 

 straight except in gravid females. Tail sector about '^/q longer than body sector to cloaca. 

 Caudal peduncle laterally compressed, about twice as high as broad at origin of caudal, 

 without lateral keels or precaudal pit above or below. Dermal denticles close-spaced and 

 usually overlapping, with short pedicels and horizontal blades, the latter regularly tri- 

 dentate, the median tooth narrow and much the longest 5 3 ridges, the median ridge flat- 

 topped distally but rounded proximally. 



Head to 5th gill opening about Vs of total length, flattened above, its dorsal profile 

 sloping steeply downward. Snout in front of mouth about Vs of length of head to origin 

 of pectoral, or a little less, its tip thin and broadly ovate. Eye oval, about 3 times as long 

 as high, and noticeably large, its horizontal diameter about % as long as snout in front of 

 mouth, the larger specimens with a well marked subocular fold which is separated from 

 the margin of the lower eyelid at both ends when the latter is drawn down, but this Is 

 only faintly indicated when the lower eyelid is drawn up over eyeball, or in small speci- 

 mens even when the eye is wide open. Spiracle oval, its longest diameter only about V^^ to 

 Ve as long as horizontal diameter of eye, situated slightly below level of center of latter 

 and behind it by a distance slightly less than V2 an eye's length. Gill openings deeply con- 

 cave anteriorly, the 4th to 5th over the origin of the pectoral, the ist, 2nd, 3rd, and 4th 

 about V2 as long as the horizontal diameter of the eye, the 5 th considerably shorter and 

 situated noticeably higher on the sides than the ist to 4th 5 the interspaces between gill 

 openings about V2 to % as wide as lengths of latter. Nostril moderately oblique, its inner 

 corner a little less than V3 as far from front of mouth as from tip of snout, its anterior mar- 

 gin expanded as a low, subquadrate lobe. Mouth broadly ovate, occupying about % of 

 breadth of head, and a little less than V2 as high as broad, with a very short labial furrow 

 on each jaw. 



